Title:
複数のマルチディスクリプティブビットストリームを生成するための方法およびエンコーダおよびデコーダ
Document Type and Number:
Japanese Patent JP4746225
Kind Code:
B2
Abstract:
A method and apparatus for performing multiple descriptive source coding in which a plurality of homogeneous encoders are advantageously employed in combination with a corresponding plurality of advantageously substantially identical decoders. In particular, diversity is provided to the multiple encoders by modifying the quantization process in at least one of the encoders such that the modified quantization process is based at least on a quantization error resulting from the quantization process of another one of the encoders. In this manner, diversity among the multiple bit streams is obtained, and in particular, the quality of a reconstructed signal based on a combination of multiple decoded bit streams at the receiver is advantageously superior to that based on any one of the decoded bit streams. In accordance with a first illustrative embodiment of the present invention, two Pulse Code Modulation (PCM) coders are employed. In accordance with a second illustrative embodiment of the present invention, two Adaptive Differential Pulse Code Modulation (ADPCM) coders are employed. And in accordance with a third illustrative embodiment of the present invention, two Low-Delay Code Excited Linear Prediction (LD-CELP) coders are employed. In each case, diversity is ensured by an appropriate modification to the quantization process of at least one of the encoders, and the total error may be advantageously reduced when decoded bit streams from both coders are combined at the receiver.
Inventors:
Chain chain
Application Number:
JP2001277514A
Publication Date:
August 10, 2011
Filing Date:
September 13, 2001
Export Citation:
Assignee:
Alcatel-Lucent USA Inc.
International Classes:
H03M7/30; G10L19/00; G10L19/02; H04B14/04
Domestic Patent References:
| JP2000232648A | ||||
| JP10336040A |
Other References:
Cheng-Chien Lee,DIVERSITY CONTOROL AMONG MULTIPLE CODERS:A SIMPLE APPROACH TO MULTIPLE DESCRIPTIONS,Speech Coding,2000.proceedings.2000 IEEE Workshop on,2000年 9月17日,pp.69-71
Hamid Jafarkhani,Vahid Tarokh,MULTIPLE DESCRIPTION TRELLIS CODED QUANTIZATION,Image Processing,1998.ICIP 98.Proceedings.1998 International Conference on,1998年10月,vol.1,pp.669-673
Hamid Jafarkhani,Vahid Tarokh,MULTIPLE DESCRIPTION TRELLIS CODED QUANTIZATION,Image Processing,1998.ICIP 98.Proceedings.1998 International Conference on,1998年10月,vol.1,pp.669-673
Attorney, Agent or Firm:
Okabe
Masao Okabe
Nobuaki Kato
Kazuo
Shinichi Usui
Ikuo Fujino
Takao Ochi
Teruhisa Motomiya
Norimichi Takanashi
Asahi Shinmitsu
Seiichiro Takahashi
Koji Yoshizawa
Hirofumi Mimata
Masao Okabe
Nobuaki Kato
Kazuo
Shinichi Usui
Ikuo Fujino
Takao Ochi
Teruhisa Motomiya
Norimichi Takanashi
Asahi Shinmitsu
Seiichiro Takahashi
Koji Yoshizawa
Hirofumi Mimata